Which of the following nutrients can yield energy and provide materials for forming the structures and working parts of body tissues 1) carbohydrates 2) protein 3) fats 4) vitamins

Nucleic acid certain protein cell membranes certain carbohydrates

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these